<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
    <title>Document</title>
</head>

<body>
    <div id="lamb">
        <div class="circle">
        </div>
    </div>
</body>
<style>
    body {
        height: 100vh;
        background-color: #000;
        width: 100%;
        overflow: hidden;
        cursor: url(cursor.png) 3 3, default;
    }

    #lamb {
        width: 50px;
        height: 50px;
        position: absolute;
        transition: .1s;
    }

    .circle {
        width: 20px;
        height: 20px;
        border-radius: 50%;
        background-color: #fff;
        opacity: 1;
        transition: 1s;
    }
</style>
<script>
    var id = 0;
    $(function () {
        $('body').mousemove(function (eve) {
            clearInterval(id);
            $('#lamb').css('transform', 'translate3d(' + eve.clientX + 'px,' + eve.clientY + 'px,0px)');
            $('.circle').css('transform', 'scale(2)');
            $('.circle').css('opacity', '.1');
            id = setInterval(function () {
                $('#lamb').css('transform', 'translate3d(' + eve.clientX + 'px,' + eve.clientY +
                    'px,0px)');
                $('.circle').css('transform', 'scale(1)');
                $('.circle').css('opacity', '1');
            }, 100);
        })
    });
</script>

</html>